Sidewalk cracks

Tara counts these as she is walking. It becomes very important for her to keep count and not be interrupted.

Condoms

Donna and Tara go into the pharmacist to buy these when Donna tells Tara that she is having sex with Chuck.

Doorknobs

One of the things that Tara feels compelled to do is to touch doorknobs with all ten fingers with exactly the same pressure and then kiss her fingers. At the worst point, she would need to do this thirty-three times exactly before she could leave the house.

The Carnival

This is where one of the low points of Tara's life takes place when her mother sees her crossing herself compulsively and knocks people out of the way at the end of the ride to shake Tara until they were both crying.